<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <!--
 页面内引入优先级更低
 -->
    <link rel="stylesheet" type="text/css" href="1.css" />
    <style>
        div {
            color: blue;
            font-size: 40px;
            width: 400px;
            height: 200px;
            border: 10px solid red
        }
    </style>
</head>
<body>
<!--行内引入，优先级更高-->
<div style="color: red;font-size: 40px;width: 500px;height: 100px;border: 10px solid green">div元素1</div>
<div>div元素2</div>
<div>div元素3</div>
<span>span元素3</span>
<span>span元素3</span>
<span>span元素3</span>
</body>
</html>